Adaptive Signals 101

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Adaptive Signals 101

  1. 1. AN INTRODUCTION TO
  2. 2. Outline Example of systems & definition How did Sain get involved? Scan Tour & ALDOT’s reaction How it works  Different systems Graphs Status of ALDOT ProjectsJAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 2
  3. 3. Example of Systems InSync SCATS SCOOT ACS Lite Several others…JAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 3
  4. 4. Definition Traffic signal timing control technology that has the ability to utilize real-time traffic information to adjust traffic signal system timings in an effort to reduce congestion and delay.JAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 4
  5. 5. How did we get involved? FHWA Every Day Counts (EDC)  EDC is designed to identify and deploy innovation aimed at shortening project delivery, enhancing the safety of our roadways, and protecting the environment. Adaptive Signal Control Subcommittee  Members consist of ALDOT, FHWA, City of Montgomery, and Sain Associates  Sain is the only consultant on the committee!JAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 5
  6. 6. Committee Members FHWA  Jeff Dogan ALDOT  Stacey Glass, Gary Moore, Kim Norton, Robert Blankenship City of Montgomery  Bubba Bowden, Tim Foster Sain Associates  Jeff StephensonJAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 6
  7. 7. Scan Tour: Sep. 12-142011 Visited 3 locations in GA  (1) City of Alpharetta 3 1 ○ Tested InSync, SCOOT 2  (2) Columbia County ○ Running InSync  (3) Cobb County ○ Running SCATS Group recommended SCATS to ALDOT front office for initial implementation in ALJAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 7
  8. 8. ALDOT InitialImplementation (1) Montgomery  Southern Boulevard/Eastern Boulevard (2) Birmingham area  US-280 3 2 1 (3) Huntsville  Governors DriveJAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 8
  9. 9. Signal Timing Methods Free/Isolated Time Based Coordination Traffic Responsive Adaptive ControlJAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 9
  10. 10. Adaptive Control – How? The tactics of different systems work different ways, however… The general idea is that data being collected by the vehicle detectors is being used in real time to determine the signal timings. Wide range of % reductions in delay reported by various adaptive signal controlsJAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 10
  11. 11. SCOOT Split Cycle Offset Optimization Technique Used worldwide, a lot in Great Britain Uses data from advance detectors, models progression from detector to stopline Factors for queuing Central server and on-street firmware Requires communication Need computer programming background to understand system commands required to operate and maintain the systemJAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 11
  12. 12. InSync Rhythm Engineering Plug-and-play Controller set in free mode using existing firmware Detector data taken, analyzed, and sends calls to controller Requires communication Newer program, still customizing on the fly to meet customers needsJAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 12
  13. 13. SCATS Sydney Coordinated Adaptive Traffic System Originated in Australia, found worldwide, about 1/3 are in Australia Uses stopline video detection (6 x 15 zones) to detect/measure gaps Central server selects pre-determined cycle/split/offsets Communication required Synchro still needed!JAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 13
  14. 14. JAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 14
  15. 15. SCATS (Cont’d) Certain models of controller are required to run SCATS US-280 getting Eagle M50 model Governors Drive getting 2070 SCATS firmware installs alongside traditional firmware on street controller Any mode of detection works, but video is recommended Engineering design element of project is generally required for implementation of equipment modificationsJAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 15
  16. 16. “Never retimed” to“Adaptive”JAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 16
  17. 17. “Retimed” to “Adaptive”JAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 17
  18. 18. SavingsJAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 18
  19. 19. Adaptive vs. TOD 140 120 100 80 Adaptive Cycle 60 TOD Cycle 40 20 0 12 2 4 6 8 10 12 2 4 6 8 10 12JAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 19
  20. 20. ALDOT Project Status Montgomery  PS&E held Jan 4  May 25 2012 Project Letting Birmingham  PS&E is Jan 26  May 25 2012 Project Letting Huntsville  PS&E TBD (Feb 8 or Feb 9)  May 25 2012 Project Letting ALDOT Transportation Director wants all implemented by June 2012JAN 24 2012 INTRO TO ADAPTIVE SIGNAL CONTROL 20

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